US3852072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic products and processes comprising synthetic nuclear isotopes
Assignee: Polaroid Corp
•
Filing: 1972-05-11
•
Granted: 1974-12-03
•
Expires: 1992-05-11
Abstract
Abstract Photosensitive silver halide emulsions having increased photographic sensitivity are prepared by incorporating therein a nuclear radiation source.
Inventors
- 👤 A Gerber
- 👤 V Walworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:17
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
49 words
THE METHOD FOR ENHANCING PHOTOGRAPHIC SENSIVITY OF A SILVER HALIDE EMULSION WHICH COMPRISES DISPOSING A NUCLEAR RADIATION SOURCE IN THE SILVER HALIDE EMULSION PRIOR TO CASTING A LAYER OF SAID EMULSION IN AN AMOUNT SUFFICIENT TO PROVIDE SUFFICIENT INTERACTION WITH THE SILVER HALIDE GRAINS TO PROVIDE SAID ENHANCED SENSIVITY.
Claim 2
Independent Claim
49 words
THE METHOD FOR ENHANCING PHOTOGRAPHIC SENSIVITY OF A SILVER HALIDE EMULSION WHICH COMPRISES DISPOSING A NUCLEAR RADIATION SOURCE IN THE SILVER HALIDE EMULSION PRIOR TO CASTING A LAYER OF SAID EMULSION IN AN AMOUNT SUFFICIENT TO PROVIDE SUFFICIENT INTERACTION WITH THE SILVER HALIDE GRAINS TO PROVIDE SAID ENHANCED SENSIVITY.
Claim 3
Dependent Claim
14 words
The method as defined in claim 1 wherein said source comprises an alpha emitter.
Claim 4
Dependent Claim
14 words
The method as defined in claim 1 wherein said source comprises a beta emitter.
Claim 5
Dependent Claim
14 words
The method as defined in claim 1 wherein said source comprises a gamma emitter.
Claim 6
Dependent Claim
16 words
The method as defined in claim 1 wherein said source comprises a beta and gamma emitter.
Claim 7
Dependent Claim
21 words
The method as defined in claim 1 wherein said source is added just prior to coating said emulsion on a support.
Claim 8
Dependent Claim
20 words
The method as defined in claim 1 wherein said source is added to the emulsion prior to ripening the emulsion.
Claim 9
Dependent Claim
23 words
The method as defined in claim 1 which includes the step of removing the residue of the nuclear radiation source from said emulsion.
Claim 10
Dependent Claim
13 words
The method as defined in claim 4 wherein said gamma source comprises indium-113m.
Claim 11
Dependent Claim
31 words
The method as defined in claim 1 wherein sufficient nuclear radiation source is added to said emulsion to expose the silver halide grains in said emulsion to a subthreshold fog level.
Claim 12
Dependent Claim
21 words
The method as defined in claim 1 wherein said nuclear radiation source has a half life of less than 6 hours.
Claim 13
Dependent Claim
28 words
The method as defined in claim 11 wherein said nuclear radiation source is added at a level of between about 0.01 and 1.0 millicuries per gram of silver.
Claim 14
Dependent Claim
30 words
A product which comprises a photosensitive silver halide emulsion having a residue therein from the decay of a synthetic nuclear isotope having a half life of less than 1 day.
Claim 15
Dependent Claim
30 words
A product which comprises a photosensitive silver halide emulsion having a residue therein from the decay of a synthetic nuclear isotope having a half life of less than 1 day.
Claim 16
Dependent Claim
14 words
The product as defined in claim 13 wherein said source comprises an alpha emitter.
Claim 17
Dependent Claim
14 words
A product as defined in claim 13 wherein said source comprises a beta emitter.
Claim 18
Dependent Claim
14 words
A product as defined in claim 13 wherein said source comprises a gamma emitter.
Claim 19
Dependent Claim
17 words
A product as defined in claim 13 wherein said source comprises a beta and a gamma emitter.
Claim 20
Dependent Claim
12 words
A product as defined in claim 16 wherein said residue is indium-113m.
Claim 21
Independent Claim
48 words
A method for preparing a photosensitive silver halide emulsion which comprises reacting a water soluble silver salt with at least one water soluble halide in the presence of a nuclear radiation source in an amount sufficient to provide enhanced photograpahic sensitivity by interaction with the silver halide grains.
Claim 22
Independent Claim
48 words
A method for preparing a photosensitive silver halide emulsion which comprises reacting a water soluble silver salt with at least one water soluble halide in the presence of a nuclear radiation source in an amount sufficient to provide enhanced photograpahic sensitivity by interaction with the silver halide grains.
Claim 23
Dependent Claim
14 words
The method as defined in claim 19 wherein said source is an alpha emitter.
Claim 24
Dependent Claim
14 words
The method as defined in claim 19 wherein said source is a beta emitter.
Claim 25
Dependent Claim
14 words
The method as defined in claim 19 wherein said source is a gamma emitter.
Claim 26
Dependent Claim
17 words
The method as defined in claim 19 wherein said source comprises a beta and a gamma emitter.
Claim 27
Dependent Claim
13 words
The method as defined in claim 22 wherein said gamma emitter is indium-113m.
Claim 28
Dependent Claim
14 words
The product which comprises a photosensitive silver halide emulsion containing a nuclear radiation source.
Claim 29
Dependent Claim
14 words
The product which comprises a photosensitive silver halide emulsion containing a nuclear radiation source.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |